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In an interview that appeared in a weekly plumbing magazine, the chairperson of the Plumbing Association stated that plumbers are called 45% more on Fridays than on any other day of the week. The chairperson claimed that, though unexplained, it seems pipes are 45% more likely to burst on Fridays.
Which of the following, if true, would most seriously weaken the chairperson's claim that pipes are 45% more likely to burst on Fridays?
A) Not only plumbers but also electricians are requested to fix appliances on Fridays more than on any other day of the week.
B) People are more concerned about their houses being intact before the weekend than on any other time during the week.
C) A comprehensive survey of 504 households throughout the United States clearly shows that plumbers are called 45% less frequently on Sundays than on any other day of the week.
D) Plumbers charge twenty percent more for house calls made on Friday.
E) There is an undeniable correlation between the strength of the metal used for pipes and the anti-oxidizing coating it is painted with prior to installation.
OA B
Source: Economist Gmat
Which of the following, if true, would most seriously weaken the chairperson's claim that pipes are 45% more likely to burst on Fridays?
A) Not only plumbers but also electricians are requested to fix appliances on Fridays more than on any other day of the week.
B) People are more concerned about their houses being intact before the weekend than on any other time during the week.
C) A comprehensive survey of 504 households throughout the United States clearly shows that plumbers are called 45% less frequently on Sundays than on any other day of the week.
D) Plumbers charge twenty percent more for house calls made on Friday.
E) There is an undeniable correlation between the strength of the metal used for pipes and the anti-oxidizing coating it is painted with prior to installation.
OA B
Source: Economist Gmat
